Tackle block



W. WRIGHT TACKLE BLOCK May 21, 1929.

Filed July 20, 1927 I5 Sheets-$heet INVENTOR MY/1k BY Wr/f/ii ATTORNEY May 21, 1929. W I T 513,586

TACKLE BLOCK Filed July 20, 192 3 Sheets-Sheet 2 INVENTOR 147/0017; IVr/g/If BY ATTORNEY I5 Sheets-Sheet I INVENTOR ATTORNEY May 21, 1929. w. WRIGHT TACKLE BLOCK Filed July 20, 1927 FlIlIl-Iia ll IIIL Patented May 21, 1929.

UNITED STATES PATENT OFFICE.

WILLIAM: WRIGHT, OF TULSA, OKLAHOMA, ASSIGNOR TO. OKLAHOMA IRON WORKS, OF TULSA, OKLAHOMA, A CORPORATION OF OKLAHOMA.

TACKLE BLOCK.

Application filed July 20,

Mv invention relates to tackle blocks and more particularly to a device of that character for use in rotary'or standard well drilling equipment for letting-111 easing,

tubing and drill pipe and for other like uses common in well drilling operations; the principal object of the present invention being to provide a strong, compact tackle block which may be easily and quickly assembled and wherein the mechanism whereby the block is coupled to a suspended element may swivel to adapt the suspension to different angles incident to picking up the. casing, tubing or pipe for placement in the 1 hole or for setting the same on the floor of the derrick when pulled.

In accomplishing these and other ob ects of the invention 1 have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein Fig. 1 1s a perspective view of a tackle block embodying my improvements, part of the guard being broken away for better 11- lustration.

Fig. 2 is a central, transverse, vertical section of the block.

Fig. 3 is a broken, longitudinal section on the line 33, Fig. 2.

Fig. 4 is a transverse, horizontal section on the line 4.-4, Fig. 2.

Fig. 5 is an enlarged detail perspective view of a sheave wheel bushing.

Fig. 6 is an enlarged detail perspective view of a roller bearing retainer.

Referring more in detail to the drawings:

1 and 2 designate side frame members having apertures 3 at their upper ends for a clevis pin 4, which extends through and beyond the apertures and is provided with transverse slots 5 in such projecting portion. 6 designates a clevis comprising a body portion 7 mounted on the clevis pin 4 and interposed between the frame members 1 and 2 to space the latter at their upper ends and provided with end portions 8 which project over the top of the frame members and have downwardly projecting lips 9 forming slots 10 within which the upper edges of the frame members are received to key the frame members together and retain the same against outward spread.

The body of the clevis member is extended and provided with an aperture 11 for re- 1927. Serial No. 207,191.

eeiving the end 12 of a supporting cable 13, which ma be run over a crown block at the top 0 the derrick and in strands of a number dependent on the nature of the work on which the tackle is employed.

Located in the side frame members below the clevis pin openings are other paired openings 14 for receiving the reduced ends 15 of'an axlepin 16, the body portion of which is of greater diameterthan the reduced end portions, forming shoulders 17 which engage the inner faces of the side frame members to space said members at that point.

The axle pin carries sheave Wheels 18 of any desired number according to the duty for which the block is intended and which preferably are of the construction and mounting hereinafter described. The extended portions 15 of the axle pin are provided with opposite, transverse slots 19, the upper ones of which register with the slots 5 in the clevis pin so that opposite ends of key bars 20 may project into the slots of the respective pins to key the pins against rotation and hold the pins in the frame. The bars 20 are securely attached to the outer faces of the frame members, preferably by screws 21, having heads 22 countersunk in the bars to avoid projections which might engage the derrick or other equipment to interfere with or damage the tackle block or the equipment.

A guard 23 attached to the frame members houses the sheave wheels and is provided with slots 24 for the strands of the cable 13, the guard extending sufiiciently below the lower run of the sheave wheels to revent accidental interposition of objects )etween the cable and wheels and serving as a safeguard for workmen.

Located in the projected ends of the reduced portions of the axle pin opposite the slots 19 are similar slots 25, for receiving other key bars which will presently be described.

In the lower ends of the side frame members 1 and 2 are openings 26 carrying bushings 27 for trunnions 28 formed integrally with a supporting member 29, preferably consisting of a circular disk and having a central aperture 30. The ends of the trunnions project beyond the outer faces of the side frame members and are provided with annular grooves 31 for receiving the end; of key bars 32, the upper ends of which project into the lower transverse slots in the projecting ends of the axle pin, the bars being attached to the frame members by screws 33 having countersunk heads 34.

With this arrangement the upper key bars serve to retain the clevis and axle pins in assembled relation with the frame members and prevent rotation of the pins, thereby eliminatin wear on the parts. The key bars 32 assist in holding the axle pin in place and against rotation and serve to retain the supporting member 29 to the frame members, but permit rotation 'of the supporting members and provide a swiveling mounting -of the supporting member in the frame.

Other key bars 35 are attached to the lower ends of the side frame members by screws 36 and project into the grooves 31 in the supporting member trunnions to facilitate anc orage of the supporting member without interfering with its rotative movement. Extending through the aperture 30 in the supporting member is a stem 37, having a vertical groove 38 receiving a spline 39 on the supporting memberto permit longitudinal movement of the stem and prevent its rotation in the supporting member.

Mounted on the supporting member 29 is a barrel 40. Fixed to the upper end of the stem, preferably by screw threads and transverse pins 41, is an inverted cup 42 which telescopes the barrel and is of sufficient longitudinal dimension to permit vertical play of the telescoping members. Seated on the supporting member 29, about the stem within the telescoping members and supporting the cup 42, is a compression spring 43, which serves to normally yieldingly retain the stem at the upper limit of its movement.

On the lower end of the stem is a laterally extended base 44, having an upwardly facing groove 45 for anti-friction rollers 46. Suspended from the base is an inverted cupshaped coupling head 47, having a central aperture in its base for the stem 37 and having a downwardly facing annular groove 48, registering with the groove 45 in the stem base to form a race for anti-friction rollers 46. The interior wall of the cup is screw-threaded to receive the threaded shank 49 of a tool, here illustrated as an ordinary hook 50. v

With this arrangement a load suspended y from the hook may spin without twisting the tackle block or its suspending cable and the suspended load may be swung laterally in the derrick without carrying the full weight of the block out of its perpendicular suspension, the coupling head permitting a swivelling movement on a longitudinal axis and the supporting member a swivelling movement on a transverse axis.

of the bushings. Surrounding each bushing is a pair of keeper rings 54, each provided with a plurality of inwardly facing transverse slots 55, forming lugs 56. Each of the lugs 56 is bored to co-operate with an adjoining lug in forming a journal hearing 57 for the end of a roller 58. The sheave wheels 18 are mounted over the keeper rings and the rollers carried thereby, the peripheries of the rollers being exposed to contact with the bushings 51 and the inner surfaces of the sheave wheels to provide an antifriction mounting for the sheave wheels.

In order to lubricate the sheave wheels I provide the axle pins with longitudinal bores 59, communicating with transverse bores 60 which latter open through the periphery of the axle in communication with apertures 61 in the bushings 51 so that lubricant forced through the bores is delivered to the bearing pins and may accumulate in theslots in the keeper rings. The outer ends of the bores 59 may be closed by screw caps 62.

Assuming the parts to be constructed and assembled as described, the block is suspended in the derrick in the ordinary manner when employed in accordance with common practice, the swivel mechanism at the bottom of the block, however, permitting the spinning and tilting actions heretofore described and eliminating strain on the block and labor of operation incident to such operations with a rigid block. With the clevis and axle pins and the supporting member keyed as described and as more particularly described in my co-pending application Serial No. 209,792, filed August 1, 1927, the pins may be held against rotation,-thereb eliminating wear on the frame members an pins although ermitting rotation of the supporting mem ers, as heretofore disclosed.

Should the roller bearin above the axle pin wear, due to the rotation of the sheave wheels thereover under load of suspended elements, the axle pin may be reversed to present fresh roller hearings to the weightreceiving position or the worn pins replaced with new ones; in either event, the axle pin itself avoiding destructive wear because of the interposition of the bushin and roller bearings between it and the s eave wheels.

What I claim and desire to secure by Letters Patent is:

1. A tackle block including side frame members, clevis and axle pins carried bysaid frame members, a supporting member having trunnions journaled in said side frame members, a clevis on the clevis pin, sheave wheels on the sheave pin, coupllng mechanism on the supporting member including a swivelling head, the sheave pin having downwardly facing transverse slots in its end portions, the supporting member trunnions having annular grooves in their end portions, and key bars attached to the frame members and projected into said slots and grooves to anchor the frame members, prevent rotation of the sheave pin and permit rotation of the supporting member.

2. A tackle block including side frame members, a clevis pin carried by said members and having downwardly facing transverse slots in its outer ends, a clevis carried by said pin and spacing the side frame members, an axle pin having reduced end por-' tions carried by and spacing said frame members and having opposite upwardly and downwardly facing transverse slots in its outer ends, sheave wheels carried by said sheave pin, a supporting member spacing said frame members and having trunnions journaled in said members and provided with annular grooves in its outer ends. key bars attached to said frame members and projected into facing slots in the clevis and axle ins, and key bars attached to the frame mem rs and projected into the other slots of the axle pin and into the grooves in said trunnions.

3. A tackle block including side frame ends, sheave wheels carried by said sheave pin, a supporting member spacing said frame members and having trunnions journaled in said members and provided with annular grooves in its outer ends, key bars attached to said frame members and projected into facing slots in the clevis and axle pins, and key bars attached to the frame members and projected into the other slots of the axle pin and into the grooves in said trunnions.

4. A tackle block including side frame members, an axle pin carried by the frame members, a supporting member having trunnions journaled in said side frame members, extended therethrough and provided with annular grooves in their projecting ends, and key bars attached to the outer faces of the frame members and seated in said annular grooves to anchor the supportmg mem-- bers and permit rotation of'the supporting members.

In testimony whereof I aflix my signature.

- WILLIAM WRIGHT. 

